Postgres 10

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

CREATE TABLE tab(col INT[])
INSERT INTO tab VALUES ('{1,2,3}'), ('{}'), ('{0,9}')
3 rows affected

UPDATE tab
SET  col = array(select 1000 * unnest(col))
3 rows affected

SELECT *
FROM tab;

col

{1000,2000,3000}

{}

{0,9000}